21107551260 has 48 divisors (see below), whose sum is σ = 61670762496. Its totient is φ = 5383954752.

The previous prime is 21107551259. The next prime is 21107551261. The reversal of 21107551260 is 6215570112.

It is an interprime number because it is at equal distance from previous prime (21107551259) and next prime (21107551261).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21107551261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7646284 + ... + 7649043.

It is an arithmetic number, because the mean of its divisors is an integer number (1284807552).

Almost surely, 2^21107551260 is an apocalyptic number.

21107551260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21107551260 is an abundant number, since it is smaller than the sum of its proper divisors (40563211236).

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

21107551260 is a wasteful number, since it uses less digits than its factorization.

21107551260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15295362 (or 15295360 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 21107551260 in words is "twenty-one billion, one hundred seven million, five hundred fifty-one thousand, two hundred sixty".