21012002102 has 16 divisors (see below), whose sum is σ = 38791388832. Its totient is φ = 8312440320.

The previous prime is 21012002047. The next prime is 21012002117. The reversal of 21012002102 is 20120021012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57725099 + ... + 57725462.

It is an arithmetic number, because the mean of its divisors is an integer number (2424461802).

Almost surely, 2^21012002102 is an apocalyptic number.

21012002102 is a deficient number, since it is larger than the sum of its proper divisors (17779386730).

21012002102 is a wasteful number, since it uses less digits than its factorization.

21012002102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115450583.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21012002102 its reverse (20120021012), we get a palindrome (41132023114).

The spelling of 21012002102 in words is "twenty-one billion, twelve million, two thousand, one hundred two".