21150205501210 has 32 divisors (see below), whose sum is σ = 40129196365440. Its totient is φ = 8003790159552.

The previous prime is 21150205501163. The next prime is 21150205501309. The reversal of 21150205501210 is 1210550205112.

It is a happy number.

It is a super-2 number, since 2×21150205501210² (a number of 27 digits) contains 22 as substring.

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, 76420929 + ... + 76697188.

It is an arithmetic number, because the mean of its divisors is an integer number (1254037386420).

Almost surely, 2^{21150205501210} is an apocalyptic number.

21150205501210 is a deficient number, since it is larger than the sum of its proper divisors (18978990864230).

21150205501210 is a wasteful number, since it uses less digits than its factorization.

21150205501210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153118870.

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 21150205501210 its reverse (1210550205112), we get a palindrome (22360755706322).

The spelling of 21150205501210 in words is "twenty-one trillion, one hundred fifty billion, two hundred five million, five hundred one thousand, two hundred ten".