21152425104 has 80 divisors (see below), whose sum is σ = 61547102400. Its totient is φ = 6954211584.

The previous prime is 21152425097. The next prime is 21152425121. The reversal of 21152425104 is 40152425112.

It is a happy number.

21152425104 is a `hidden beast` number, since 2 + 11 + 524 + 25 + 104 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303834 + ... + 366905.

It is an arithmetic number, because the mean of its divisors is an integer number (769338780).

Almost surely, 2^21152425104 is an apocalyptic number.

21152425104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21152425104 is an abundant number, since it is smaller than the sum of its proper divisors (40394677296).

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

21152425104 is a wasteful number, since it uses less digits than its factorization.

21152425104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670829 (or 670817 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The spelling of 21152425104 in words is "twenty-one billion, one hundred fifty-two million, four hundred twenty-five thousand, one hundred four".