21211754630 has 32 divisors (see below), whose sum is σ = 41980170240. Its totient is φ = 7652625120.

The previous prime is 21211754611. The next prime is 21211754639. The reversal of 21211754630 is 3645711212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211754639) 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, 745220 + ... + 773159.

It is an arithmetic number, because the mean of its divisors is an integer number (1311880320).

Almost surely, 2^21211754630 is an apocalyptic number.

21211754630 is a deficient number, since it is larger than the sum of its proper divisors (20768415610).

21211754630 is a wasteful number, since it uses less digits than its factorization.

21211754630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518524.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21211754630 in words is "twenty-one billion, two hundred eleven million, seven hundred fifty-four thousand, six hundred thirty".