1221403542 has 8 divisors (see below), whose sum is σ = 2442807096. Its totient is φ = 407134512.

The previous prime is 1221403541. The next prime is 1221403567. The reversal of 1221403542 is 2453041221.

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

1221403542 is an admirable number.

It is a super-2 number, since 2×1221403542² = 2983653224820291528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221403541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101783623 + ... + 101783634.

It is an arithmetic number, because the mean of its divisors is an integer number (305350887).

Almost surely, 2^1221403542 is an apocalyptic number.

1221403542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221403542 is a wasteful number, since it uses less digits than its factorization.

1221403542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203567262.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1221403542 is about 34948.5842631715. The cubic root of 1221403542 is about 1068.9393344124.

Adding to 1221403542 its reverse (2453041221), we get a palindrome (3674444763).

The spelling of 1221403542 in words is "one billion, two hundred twenty-one million, four hundred three thousand, five hundred forty-two".