21357262130 has 16 divisors (see below), whose sum is σ = 39168413784. Its totient is φ = 8381717760.

The previous prime is 21357262097. The next prime is 21357262133. The reversal of 21357262130 is 3126275312.

It can be written as a sum of positive squares in 4 ways, for example, as 19281821881 + 2075440249 = 138859^2 + 45557^2 .

It is a super-2 number, since 2×21357262130² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21357262133) 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, 20147831 + ... + 20148890.

Almost surely, 2^21357262130 is an apocalyptic number.

21357262130 is a deficient number, since it is larger than the sum of its proper divisors (17811151654).

21357262130 is a wasteful number, since it uses less digits than its factorization.

21357262130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40296781.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 21357262130 in words is "twenty-one billion, three hundred fifty-seven million, two hundred sixty-two thousand, one hundred thirty".