21901292926947 has 48 divisors (see below), whose sum is σ = 37037616977088. Its totient is φ = 12209356661760.

The previous prime is 21901292926939. The next prime is 21901292926969. The reversal of 21901292926947 is 74962929210912.

21901292926947 is a `hidden beast` number, since 2 + 190 + 129 + 29 + 269 + 47 = 666.

It is not a de Polignac number, because 21901292926947 - 2³ = 21901292926939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (21901292921947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83591983 + ... + 83853575.

It is an arithmetic number, because the mean of its divisors is an integer number (771617020356).

Almost surely, 2^{21901292926947} is an apocalyptic number.

21901292926947 is a deficient number, since it is larger than the sum of its proper divisors (15136324050141).

21901292926947 is a wasteful number, since it uses less digits than its factorization.

21901292926947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294060 (or 294057 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The spelling of 21901292926947 in words is "twenty-one trillion, nine hundred one billion, two hundred ninety-two million, nine hundred twenty-six thousand, nine hundred forty-seven".