21920754497212 has 24 divisors (see below), whose sum is σ = 38847845576960. Its totient is φ = 10821376753200.

The previous prime is 21920754497197. The next prime is 21920754497227. The reversal of 21920754497212 is 21279445702912.

It is an interprime number because it is at equal distance from previous prime (21920754497197) and next prime (21920754497227).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12597463 + ... + 14231569.

Almost surely, 2^{21920754497212} is an apocalyptic number.

It is an amenable number.

21920754497212 is a deficient number, since it is larger than the sum of its proper divisors (16927091079748).

21920754497212 is a wasteful number, since it uses less digits than its factorization.

21920754497212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676641 (or 1676639 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 21920754497212 in words is "twenty-one trillion, nine hundred twenty billion, seven hundred fifty-four million, four hundred ninety-seven thousand, two hundred twelve".