21234215773700 has 36 divisors (see below), whose sum is σ = 48788733422772. Its totient is φ = 7994057702400.

The previous prime is 21234215773697. The next prime is 21234215773703. The reversal of 21234215773700 is 737751243212.

It is an interprime number because it is at equal distance from previous prime (21234215773697) and next prime (21234215773703).

It can be written as a sum of positive squares in 6 ways, for example, as 2173359989824 + 19060855783876 = 1474232^2 + 4365874^2 .

It is a super-2 number, since 2×21234215773700² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21234215773703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6245355881 + ... + 6245359280.

It is an arithmetic number, because the mean of its divisors is an integer number (1355242595077).

Almost surely, 2^{21234215773700} is an apocalyptic number.

21234215773700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234215773700 is an abundant number, since it is smaller than the sum of its proper divisors (27554517649072).

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

21234215773700 is a wasteful number, since it uses less digits than its factorization.

21234215773700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12490715192 (or 12490715185 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 44.

The spelling of 21234215773700 in words is "twenty-one trillion, two hundred thirty-four billion, two hundred fifteen million, seven hundred seventy-three thousand, seven hundred".