21122806488 has 32 divisors (see below), whose sum is σ = 60350876160. Its totient is φ = 6035087520.

The previous prime is 21122806433. The next prime is 21122806489. The reversal of 21122806488 is 88460822112.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122806489) 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, 62865328 + ... + 62865663.

It is an arithmetic number, because the mean of its divisors is an integer number (1885964880).

Almost surely, 2^21122806488 is an apocalyptic number.

21122806488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21122806488 is an abundant number, since it is smaller than the sum of its proper divisors (39228069672).

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

21122806488 is a wasteful number, since it uses less digits than its factorization.

21122806488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125731007 (or 125731003 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The spelling of 21122806488 in words is "twenty-one billion, one hundred twenty-two million, eight hundred six thousand, four hundred eighty-eight".