21211021010 has 32 divisors (see below), whose sum is σ = 38787154560. Its totient is φ = 8350229248.

The previous prime is 21211021003. The next prime is 21211021081. The reversal of 21211021010 is 1012011212.

It is a super-2 number, since 2×21211021010² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211020982 and 21211021000.

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, 169706 + ... + 266874.

It is an arithmetic number, because the mean of its divisors is an integer number (1212098580).

Almost surely, 2^21211021010 is an apocalyptic number.

21211021010 is a deficient number, since it is larger than the sum of its proper divisors (17576133550).

21211021010 is a wasteful number, since it uses less digits than its factorization.

21211021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97522.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21211021010 its reverse (1012011212), we get a palindrome (22223032222).

The spelling of 21211021010 in words is "twenty-one billion, two hundred eleven million, twenty-one thousand, ten".