21150254004 has 24 divisors (see below), whose sum is σ = 53837010528. Its totient is φ = 6409167840.

The previous prime is 21150253981. The next prime is 21150254009. The reversal of 21150254004 is 40045205112.

It is a super-4 number, since 4×21150254004⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150254009) 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, 80114467 + ... + 80114730.

It is an arithmetic number, because the mean of its divisors is an integer number (2243208772).

Almost surely, 2^21150254004 is an apocalyptic number.

It is an amenable number.

21150254004 is an abundant number, since it is smaller than the sum of its proper divisors (32686756524).

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

21150254004 is a wasteful number, since it uses less digits than its factorization.

21150254004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160229215 (or 160229213 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21150254004 its reverse (40045205112), we get a palindrome (61195459116).

The spelling of 21150254004 in words is "twenty-one billion, one hundred fifty million, two hundred fifty-four thousand, four".