21420152010 has 48 divisors (see below), whose sum is σ = 56987577504. Its totient is φ = 5579201376.

The previous prime is 21420152003. The next prime is 21420152051. The reversal of 21420152010 is 1025102412.

21420152010 is a `hidden beast` number, since 2 + 142 + 0 + 1 + 520 + 1 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2763592 + ... + 2771331.

It is an arithmetic number, because the mean of its divisors is an integer number (1187241198).

Almost surely, 2^21420152010 is an apocalyptic number.

21420152010 is an abundant number, since it is smaller than the sum of its proper divisors (35567425494).

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

21420152010 is a wasteful number, since it uses less digits than its factorization.

21420152010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5534979 (or 5534976 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 21420152010 its reverse (1025102412), we get a palindrome (22445254422).

The spelling of 21420152010 in words is "twenty-one billion, four hundred twenty million, one hundred fifty-two thousand, ten".