21261046027 has 8 divisors (see below), whose sum is σ = 22908143664. Its totient is φ = 19615610208.

The previous prime is 21261045989. The next prime is 21261046031. The reversal of 21261046027 is 72064016212.

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 21261046027 - 2¹⁹ = 21260521739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21261046027.

It is not an unprimeable number, because it can be changed into a prime (21261046057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388813 + ... + 440110.

It is an arithmetic number, because the mean of its divisors is an integer number (2863517958).

Almost surely, 2^21261046027 is an apocalyptic number.

21261046027 is a deficient number, since it is larger than the sum of its proper divisors (1647097637).

21261046027 is a wasteful number, since it uses less digits than its factorization.

21261046027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830909.

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 21261046027 in words is "twenty-one billion, two hundred sixty-one million, forty-six thousand, twenty-seven".