5451421021 has 8 divisors (see below), whose sum is σ = 5638843904. Its totient is φ = 5264721360.

The previous prime is 5451420979. The next prime is 5451421057. The reversal of 5451421021 is 1201241545.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5451421021 - 2⁷ = 5451420893 is a prime.

It is a super-2 number, since 2×5451421021² = 59435982296401364882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5451421091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165450 + ... + 195643.

It is an arithmetic number, because the mean of its divisors is an integer number (704855488).

Almost surely, 2^5451421021 is an apocalyptic number.

It is an amenable number.

5451421021 is a deficient number, since it is larger than the sum of its proper divisors (187422883).

5451421021 is a wasteful number, since it uses less digits than its factorization.

5451421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361611.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 5451421021 is about 73833.7390425272. The cubic root of 5451421021 is about 1759.9617998122.

Adding to 5451421021 its reverse (1201241545), we get a palindrome (6652662566).

The spelling of 5451421021 in words is "five billion, four hundred fifty-one million, four hundred twenty-one thousand, twenty-one".