21145026474 has 96 divisors (see below), whose sum is σ = 55278647424. Its totient is φ = 5754810240.

The previous prime is 21145026431. The next prime is 21145026491. The reversal of 21145026474 is 47462054112.

21145026474 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 5 + 0 + 2 + 647 + 4 = 666.

It is a super-2 number, since 2×21145026474² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15774 + ... + 206249.

It is an arithmetic number, because the mean of its divisors is an integer number (575819244).

Almost surely, 2^21145026474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21145026474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27639323712).

21145026474 is an abundant number, since it is smaller than the sum of its proper divisors (34133620950).

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

21145026474 is a wasteful number, since it uses less digits than its factorization.

21145026474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222092 (or 222089 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 21145026474 in words is "twenty-one billion, one hundred forty-five million, twenty-six thousand, four hundred seventy-four".