21470023011021 has 16 divisors (see below), whose sum is σ = 30830141353536. Its totient is φ = 13211725982976.

The previous prime is 21470023011013. The next prime is 21470023011049. The reversal of 21470023011021 is 12011032007412.

It is not a de Polignac number, because 21470023011021 - 2³ = 21470023011013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21470023010982 and 21470023011000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470023011121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11537335 + ... + 13268388.

It is an arithmetic number, because the mean of its divisors is an integer number (1926883834596).

Almost surely, 2^{21470023011021} is an apocalyptic number.

It is an amenable number.

21470023011021 is a deficient number, since it is larger than the sum of its proper divisors (9360118342515).

21470023011021 is a wasteful number, since it uses less digits than its factorization.

21470023011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24827932.

The product of its (nonzero) digits is 672, while the sum is 24.

Adding to 21470023011021 its reverse (12011032007412), we get a palindrome (33481055018433).

The spelling of 21470023011021 in words is "twenty-one trillion, four hundred seventy billion, twenty-three million, eleven thousand, twenty-one".