21262153950 has 36 divisors (see below), whose sum is σ = 57124321488. Its totient is φ = 5669907600.

The previous prime is 21262153943. The next prime is 21262153951. The reversal of 21262153950 is 5935126212.

It is a happy number.

21262153950 is a `hidden beast` number, since 2 + 1 + 262 + 1 + 5 + 395 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21262153951) 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, 23624166 + ... + 23625065.

It is an arithmetic number, because the mean of its divisors is an integer number (1586786708).

Almost surely, 2^21262153950 is an apocalyptic number.

21262153950 is an abundant number, since it is smaller than the sum of its proper divisors (35862167538).

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

21262153950 is a wasteful number, since it uses less digits than its factorization.

21262153950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47249249 (or 47249241 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 21262153950 in words is "twenty-one billion, two hundred sixty-two million, one hundred fifty-three thousand, nine hundred fifty".