21574945101 has 16 divisors (see below), whose sum is σ = 29699094528. Its totient is φ = 13917188400.

The previous prime is 21574945069. The next prime is 21574945103. The reversal of 21574945101 is 10154947512.

It is a happy number.

It is not a de Polignac number, because 21574945101 - 2⁵ = 21574945069 is a prime.

It is a super-2 number, since 2×21574945101² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21574945101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21574945103) 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, 788866 + ... + 815756.

It is an arithmetic number, because the mean of its divisors is an integer number (1856193408).

Almost surely, 2^21574945101 is an apocalyptic number.

It is an amenable number.

21574945101 is a deficient number, since it is larger than the sum of its proper divisors (8124149427).

21574945101 is a wasteful number, since it uses less digits than its factorization.

21574945101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35552.

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 21574945101 in words is "twenty-one billion, five hundred seventy-four million, nine hundred forty-five thousand, one hundred one".