2121020040772 has 12 divisors (see below), whose sum is σ = 3712474135440. Its totient is φ = 1060313144936.

The previous prime is 2121020040749. The next prime is 2121020040773. The reversal of 2121020040772 is 2770400201212.

It is a self number, because there is not a number n which added to its sum of digits gives 2121020040772.

It is not an unprimeable number, because it can be changed into a prime (2121020040773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49194622 + ... + 49237717.

It is an arithmetic number, because the mean of its divisors is an integer number (309372844620).

Almost surely, 2^{2121020040772} is an apocalyptic number.

It is an amenable number.

2121020040772 is a deficient number, since it is larger than the sum of its proper divisors (1591454094668).

2121020040772 is a wasteful number, since it uses less digits than its factorization.

2121020040772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98437730 (or 98437728 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

Adding to 2121020040772 its reverse (2770400201212), we get a palindrome (4891420241984).

The spelling of 2121020040772 in words is "two trillion, one hundred twenty-one billion, twenty million, forty thousand, seven hundred seventy-two".