21356410674 has 16 divisors (see below), whose sum is σ = 42730377408. Its totient is φ = 7115877552.

The previous prime is 21356410651. The next prime is 21356410709. The reversal of 21356410674 is 47601465312.

It is a happy number.

It is a super-2 number, since 2×21356410674² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 715662 + ... + 744905.

It is an arithmetic number, because the mean of its divisors is an integer number (2670648588).

Almost surely, 2^21356410674 is an apocalyptic number.

21356410674 is an abundant number, since it is smaller than the sum of its proper divisors (21373966734).

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

21356410674 is a wasteful number, since it uses less digits than its factorization.

21356410674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463009.

The product of its (nonzero) digits is 120960, while the sum is 39.

Adding to 21356410674 its reverse (47601465312), we get a palindrome (68957875986).

The spelling of 21356410674 in words is "twenty-one billion, three hundred fifty-six million, four hundred ten thousand, six hundred seventy-four".