21621271263562 has 8 divisors (see below), whose sum is σ = 32443887659616. Its totient is φ = 10806642043692.

The previous prime is 21621271263541. The next prime is 21621271263587. The reversal of 21621271263562 is 26536217212612.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1996787278 + ... + 1996798105.

It is an arithmetic number, because the mean of its divisors is an integer number (4055485957452).

Almost surely, 2^{21621271263562} is an apocalyptic number.

21621271263562 is a deficient number, since it is larger than the sum of its proper divisors (10822616396054).

21621271263562 is a wasteful number, since it uses less digits than its factorization.

21621271263562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993588092.

The product of its digits is 725760, while the sum is 46.

The spelling of 21621271263562 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-one million, two hundred sixty-three thousand, five hundred sixty-two".