21236640270 has 32 divisors (see below), whose sum is σ = 52052364288. Its totient is φ = 5542612128.

The previous prime is 21236640253. The next prime is 21236640277. The reversal of 21236640270 is 7204663212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236640277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7529314 + ... + 7532133.

It is an arithmetic number, because the mean of its divisors is an integer number (1626636384).

Almost surely, 2^21236640270 is an apocalyptic number.

21236640270 is an abundant number, since it is smaller than the sum of its proper divisors (30815724018).

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

21236640270 is a wasteful number, since it uses less digits than its factorization.

21236640270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15061504.

The product of its (nonzero) digits is 24192, while the sum is 33.

The spelling of 21236640270 in words is "twenty-one billion, two hundred thirty-six million, six hundred forty thousand, two hundred seventy".