21306477021654 has 16 divisors (see below), whose sum is σ = 46486858956480. Its totient is φ = 6456508188360.

The previous prime is 21306477021629. The next prime is 21306477021659. The reversal of 21306477021654 is 45612077460312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21306477021659) 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, 161412704644 + ... + 161412704775.

It is an arithmetic number, because the mean of its divisors is an integer number (2905428684780).

Almost surely, 2^{21306477021654} is an apocalyptic number.

21306477021654 is an abundant number, since it is smaller than the sum of its proper divisors (25180381934826).

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

21306477021654 is a wasteful number, since it uses less digits than its factorization.

21306477021654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322825409435.

The product of its (nonzero) digits is 1693440, while the sum is 48.

The spelling of 21306477021654 in words is "twenty-one trillion, three hundred six billion, four hundred seventy-seven million, twenty-one thousand, six hundred fifty-four".