1226920964721 has 16 divisors (see below), whose sum is σ = 1648593881088. Its totient is φ = 811599282000.

The previous prime is 1226920964699. The next prime is 1226920964749. The reversal of 1226920964721 is 1274690296221.

It is not a de Polignac number, because 1226920964721 - 2⁷ = 1226920964593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1226920964771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2928420 + ... + 3321066.

It is an arithmetic number, because the mean of its divisors is an integer number (103037117568).

Almost surely, 2^{1226920964721} is an apocalyptic number.

It is an amenable number.

1226920964721 is a deficient number, since it is larger than the sum of its proper divisors (421672916367).

1226920964721 is a wasteful number, since it uses less digits than its factorization.

1226920964721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400732.

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 1226920964721 in words is "one trillion, two hundred twenty-six billion, nine hundred twenty million, nine hundred sixty-four thousand, seven hundred twenty-one".