21311021030212 has 24 divisors (see below), whose sum is σ = 37554824759256. Its totient is φ = 10581269342208.

The previous prime is 21311021030179. The next prime is 21311021030267. The reversal of 21311021030212 is 21203012011312.

It can be written as a sum of positive squares in 4 ways, for example, as 1445227134976 + 19865793895236 = 1202176^2 + 4457106^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21311021030212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24350023 + ... + 25210030.

It is an arithmetic number, because the mean of its divisors is an integer number (1564784364969).

Almost surely, 2^{21311021030212} is an apocalyptic number.

It is an amenable number.

21311021030212 is a deficient number, since it is larger than the sum of its proper divisors (16243803729044).

21311021030212 is a wasteful number, since it uses less digits than its factorization.

21311021030212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49560807 (or 49560805 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21311021030212 its reverse (21203012011312), we get a palindrome (42514033041524).

The spelling of 21311021030212 in words is "twenty-one trillion, three hundred eleven billion, twenty-one million, thirty thousand, two hundred twelve".