2021664450 has 48 divisors (see below), whose sum is σ = 5399404416. Its totient is φ = 497640000.

The previous prime is 2021664401. The next prime is 2021664451. The reversal of 2021664450 is 544661202.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2021664451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516426 + ... + 520325.

It is an arithmetic number, because the mean of its divisors is an integer number (112487592).

Almost surely, 2^2021664450 is an apocalyptic number.

2021664450 is an abundant number, since it is smaller than the sum of its proper divisors (3377739966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021664450 is a wasteful number, since it uses less digits than its factorization.

2021664450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036779 (or 1036774 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2021664450 is about 44962.9230588938. The cubic root of 2021664450 is about 1264.4539713048.

It can be divided in two parts, 20216 and 64450, that added together give a triangular number (84666 = T₄₁₁).

The spelling of 2021664450 in words is "two billion, twenty-one million, six hundred sixty-four thousand, four hundred fifty".