21000020220210 has 64 divisors (see below), whose sum is σ = 50668001280000. Its totient is φ = 5570285714112.

The previous prime is 21000020220181. The next prime is 21000020220229. The reversal of 21000020220210 is 1202202000012.

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, 4708791 + ... + 8010789.

It is an arithmetic number, because the mean of its divisors is an integer number (791687520000).

Almost surely, 2^{21000020220210} is an apocalyptic number.

21000020220210 is an abundant number, since it is smaller than the sum of its proper divisors (29667981059790).

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

21000020220210 is a wasteful number, since it uses less digits than its factorization.

21000020220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303135.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21000020220210 its reverse (1202202000012), we get a palindrome (22202222220222).

The spelling of 21000020220210 in words is "twenty-one trillion, twenty million, two hundred twenty thousand, two hundred ten".