21213663126 has 36 divisors (see below), whose sum is σ = 42939278172. Its totient is φ = 6986905344.

The previous prime is 21213663113. The next prime is 21213663127. The reversal of 21213663126 is 62136631212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213663127) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 34605996 + ... + 34606608.

It is an arithmetic number, because the mean of its divisors is an integer number (1192757727).

Almost surely, 2^21213663126 is an apocalyptic number.

21213663126 is an abundant number, since it is smaller than the sum of its proper divisors (21725615046).

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

21213663126 is an frugal number, since it uses more digits than its factorization.

21213663126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425 (or 715 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The spelling of 21213663126 in words is "twenty-one billion, two hundred thirteen million, six hundred sixty-three thousand, one hundred twenty-six".