21137809070 has 32 divisors (see below), whose sum is σ = 43602029568. Its totient is φ = 7227492768.

The previous prime is 21137809057. The next prime is 21137809081. The reversal of 21137809070 is 7090873112.

It is a super-3 number, since 3×21137809070³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

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, 385712 + ... + 437091.

It is an arithmetic number, because the mean of its divisors is an integer number (1362563424).

Almost surely, 2^21137809070 is an apocalyptic number.

21137809070 is an abundant number, since it is smaller than the sum of its proper divisors (22464220498).

21137809070 is a wasteful number, since it uses less digits than its factorization.

21137809070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823184.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 21137809070 in words is "twenty-one billion, one hundred thirty-seven million, eight hundred nine thousand, seventy".