21000221021210 has 64 divisors (see below), whose sum is σ = 40231281847680. Its totient is φ = 7869827911680.

The previous prime is 21000221021189. The next prime is 21000221021231. The reversal of 21000221021210 is 1212012200012.

It is an interprime number because it is at equal distance from previous prime (21000221021189) and next prime (21000221021231).

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, 23351822 + ... + 24234438.

It is an arithmetic number, because the mean of its divisors is an integer number (628613778870).

Almost surely, 2^{21000221021210} is an apocalyptic number.

21000221021210 is a deficient number, since it is larger than the sum of its proper divisors (19231060826470).

21000221021210 is a wasteful number, since it uses less digits than its factorization.

21000221021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884031.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000221021210 its reverse (1212012200012), we get a palindrome (22212233221222).

The spelling of 21000221021210 in words is "twenty-one trillion, two hundred twenty-one million, twenty-one thousand, two hundred ten".