20961212 has 6 divisors (see below), whose sum is σ = 36682128. Its totient is φ = 10480604.

The previous prime is 20961181. The next prime is 20961251. The reversal of 20961212 is 21216902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2620148 + ... + 2620155.

It is an arithmetic number, because the mean of its divisors is an integer number (6113688).

Almost surely, 2^20961212 is an apocalyptic number.

It is an amenable number.

20961212 is a deficient number, since it is larger than the sum of its proper divisors (15720916).

20961212 is a wasteful number, since it uses less digits than its factorization.

20961212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240307 (or 5240305 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20961212 is about 4578.3416211550. The cubic root of 20961212 is about 275.7224508051.

The spelling of 20961212 in words is "twenty million, nine hundred sixty-one thousand, two hundred twelve".