21223545534 has 32 divisors (see below), whose sum is σ = 47196656640. Its totient is φ = 7069531896.

The previous prime is 21223545521. The next prime is 21223545589. The reversal of 21223545534 is 43554532212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60654 + ... + 214769.

It is an arithmetic number, because the mean of its divisors is an integer number (1474895520).

Almost surely, 2^21223545534 is an apocalyptic number.

21223545534 is an abundant number, since it is smaller than the sum of its proper divisors (25973111106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223545534 is a wasteful number, since it uses less digits than its factorization.

21223545534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276861 (or 276855 counting only the distinct ones).

The product of its digits is 144000, while the sum is 36.

The spelling of 21223545534 in words is "twenty-one billion, two hundred twenty-three million, five hundred forty-five thousand, five hundred thirty-four".