213421506636 has 96 divisors (see below), whose sum is σ = 563593854208. Its totient is φ = 62407376640.

The previous prime is 213421506631. The next prime is 213421506677. The reversal of 213421506636 is 636605124312.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 213421506594 and 213421506603.

It is not an unprimeable number, because it can be changed into a prime (213421506631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181750 + ... + 678141.

Almost surely, 2^213421506636 is an apocalyptic number.

213421506636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

213421506636 is an abundant number, since it is smaller than the sum of its proper divisors (350172347572).

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

213421506636 is a wasteful number, since it uses less digits than its factorization.

213421506636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859991 (or 859989 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 213421506636 in words is "two hundred thirteen billion, four hundred twenty-one million, five hundred six thousand, six hundred thirty-six".