21206067330 has 64 divisors (see below), whose sum is σ = 59151098880. Its totient is φ = 4764944064.

The previous prime is 21206067307. The next prime is 21206067383. The reversal of 21206067330 is 3376060212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 843384 + ... + 868163.

It is an arithmetic number, because the mean of its divisors is an integer number (924235920).

Almost surely, 2^21206067330 is an apocalyptic number.

21206067330 is an abundant number, since it is smaller than the sum of its proper divisors (37945031550).

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

21206067330 is a wasteful number, since it uses less digits than its factorization.

21206067330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711623.

The product of its (nonzero) digits is 9072, while the sum is 30.

The spelling of 21206067330 in words is "twenty-one billion, two hundred six million, sixty-seven thousand, three hundred thirty".