21470667620534 has 24 divisors (see below), whose sum is σ = 35416551168264. Its totient is φ = 9754827271200.

The previous prime is 21470667620531. The next prime is 21470667620551. The reversal of 21470667620534 is 43502676607412.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470667620531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20241332 + ... + 21275639.

It is an arithmetic number, because the mean of its divisors is an integer number (1475689632011).

Almost surely, 2^{21470667620534} is an apocalyptic number.

21470667620534 is a deficient number, since it is larger than the sum of its proper divisors (13945883547730).

21470667620534 is a wasteful number, since it uses less digits than its factorization.

21470667620534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41519132 (or 41519121 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 53.

The spelling of 21470667620534 in words is "twenty-one trillion, four hundred seventy billion, six hundred sixty-seven million, six hundred twenty thousand, five hundred thirty-four".